The contracting parties shall conduct cooperation to crack down on illegal immigration, including the crack down on illegal transportation of natural persons via its territory.

缔约双方将合作打击非法移民，包括打击通过本国领土非法运送自然人的行为。

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In the stage of field population study, most study focus on the congregation and immigration of insect population, the investigation of natural population quantity.

在田间种群研究阶段，主要进行种群聚集与扩散迁移的研究和自然种群的数量调查。

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It makes natural person benefiting from the movement, at the same time, it also brings economic benefits and talent advantages to countries. Compared with the immigration system, it more flexible.

自然人流动不仅使自然人本身获益，而且给各国带来了经济效益和人才效益，与移民制度相比，更具有灵活性。

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The US desperately needs no less than 27 million new jobs to soak up natural population and immigration growth and get us back to a traditional 5% unemployment rate.

FORBES: Welcome to the Michael Jackson Economy

With their classic Texas sound intact throughout and with songs covering timely themes such immigration, financial strain and natural disaster The Flatlanders' members carry on with as much relevance today as they had when they first got together.

NPR: The Flatlanders On Mountain Stage

Without going into the specific reasons for immigration or their merits (or demerits), it is enough to note that the political leadership in the United States must consider the effects of population growth on natural resources and the environment as it considers immigration reform.

FORBES: U.S. Needs Immigration Reform - Part 3